Generally the error message you're seeing means that either the username or master password is being entered incorrectly. Could you try logging in to https://lastpass.com/?ac=1 making sure your username is in all lowercase and that the master password is at least 12 characters long and a combination of upper and lower case letters, numbers and symbols? Please also be sure caps lock is not on as the master password is case sensitive.
If you're not able to log in with the above tips or see the same error message, please send me a Private Message to let me know your LastPass account email so that we can investigate further.
RachelO is a member of the LogMeIn Community Care Team.
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